Saturday, 29 October 2016

Networking Cables

Networking
Cablesare
used to connect one network device to other or to connect two or more computers
to shareprinter,scanneretc. Different
types of network cables likeCoaxial
cable,Optical
fiber cable,Twisted
Paircables
are used depending on the network'stopology,protocoland size. The
devices can be separated by a few meters (e.g. viaEthernet) or
nearly unlimited distances (e.g. via the interconnections of theInternet).

Whilewirelessmay be the wave
of the future, mostcomputer
networkstoday
still utilize cables to transfer signals from one point to another.

1.Optical
fiber cable

Anoptical
fiber cableis acablecontaining one or moreoptical fibers. The optical fiber elements are typically
individually coated with plastic layers and contained in a protective tube
suitable for the environment where the cable will be deployed.

2.Coaxial
cable

Coaxial lines confine the
electromagnetic wave to the area inside the cable, between the center conductor
and the shield. The transmission of energy in the line occurs totally through
the dielectric inside the cable between the conductors. Coaxial lines can
therefore be bent and twisted (subject to limits) without negative effects, and
they can be strapped to conductive supports without inducing unwanted currents
in them.

The most common use for coaxial
cables is for television and other signals with bandwidth of multiple
megahertz. Although in most homes coaxial cables have been installed for
transmission ofTVsignals, new
technologies (such as theITU-TG.hnstandard) open
the possibility of using home coaxial cable for high-speedhome networkingapplications

3.Shielded
Twisted Pair (STP)

Shielded twisted pair (STP) is
suitable for environments with electrical interference; however, the extra
shielding can make the cables quite bulky. Shielded twisted pair is often used
on networks using Token Ring topology.

Although UTP cable is the least
expensive cable, it may be susceptible to radio and electrical frequency
interference (it should not be too close to electric motors, fluorescent
lights, etc.). If you must place cable in environments with lots of potential
interference, or if you must place cable in extremely sensitive environments
that may be susceptible to the electrical current in the UTP, shielded twisted
pair may be the solution. Shielded cables can also help to extend the maximum
distance of the cables.

Shielded twisted pair cable is
available in three different configurations:

1.Each
pair of wires is individually shielded with foil.

2.There
is a foil or braid shield inside the jacket covering all wires (as a group).

3.There
is a shield around each individual pair, as well as around the entire group of
wires (referred to as double shield twisted pair).

4.UTP

Twisted pair cabling comes in two
varieties: shielded and unshielded. Unshielded twisted pair (UTP) is the most
popular and is generally the best option for school networks. The quality of
UTP may vary from telephone-grade wire to extremely high-speed cable. The cable
has four pairs of wires inside the jacket. Each pair is twisted with a
different number of twists per inch to help eliminate interference from
adjacent pairs and other electrical devices. The tighter the twisting, the
higher the supported transmission rate and the greater the cost per foot. The
EIA/TIA (Electronic Industry Association/Telecommunication Industry
Association) has established standards of UTP and rated six categories of wire
(additional categories are emerging). A disadvantage of UTP is that it may be
susceptible to radio and electrical frequency interference.

1 comment:

Cables are best resource to connect one device to others manually, Sometime It creates problem to connected by some cables error. I have use branded cable wire for continue program. Buy the outdoor networking cable online at best price. Network Cable